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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/lib/iomgr/resolve_address_custom.h"
#include <string.h>
#include <string>
#include "absl/strings/str_format.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/address_utils/sockaddr_utils.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/host_port.h"
#include "src/core/lib/iomgr/iomgr_custom.h"
#include "src/core/lib/iomgr/port.h"
struct grpc_custom_resolver {
grpc_closure* on_done = nullptr;
grpc_resolved_addresses** addresses = nullptr;
std::string host;
std::string port;
};
static grpc_custom_resolver_vtable* resolve_address_vtable = nullptr;
static int retry_named_port_failure(grpc_custom_resolver* r,
grpc_resolved_addresses** res) {
// This loop is copied from resolve_address_posix.c
const char* svc[][2] = {{"http", "80"}, {"https", "443"}};
for (size_t i = 0; i < GPR_ARRAY_SIZE(svc); i++) {
if (r->port == svc[i][0]) {
r->port = svc[i][1];
if (res) {
grpc_error_handle error = resolve_address_vtable->resolve(
r->host.c_str(), r->port.c_str(), res);
if (error != GRPC_ERROR_NONE) {
GRPC_ERROR_UNREF(error);
return 0;
}
} else {
resolve_address_vtable->resolve_async(r, r->host.c_str(),
r->port.c_str());
}
return 1;
}
}
return 0;
}
void grpc_custom_resolve_callback(grpc_custom_resolver* r,
grpc_resolved_addresses* result,
grpc_error_handle error) {
GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
grpc_core::ApplicationCallbackExecCtx callback_exec_ctx;
grpc_core::ExecCtx exec_ctx;
if (error == GRPC_ERROR_NONE) {
*r->addresses = result;
} else if (retry_named_port_failure(r, nullptr)) {
return;
}
if (r->on_done) {
grpc_core::ExecCtx::Run(DEBUG_LOCATION, r->on_done, error);
}
delete r;
}
static grpc_error_handle try_split_host_port(const char* name,
const char* default_port,
std::string* host,
std::string* port) {
/* parse name, splitting it into host and port parts */
grpc_core::SplitHostPort(name, host, port);
if (host->empty()) {
return GRPC_ERROR_CREATE_FROM_COPIED_STRING(
absl::StrFormat("unparseable host:port: '%s'", name).c_str());
}
if (port->empty()) {
// TODO(murgatroid99): add tests for this case
if (default_port == nullptr) {
return GRPC_ERROR_CREATE_FROM_COPIED_STRING(
absl::StrFormat("no port in name '%s'", name).c_str());
}
*port = default_port;
}
return GRPC_ERROR_NONE;
}
static grpc_error_handle blocking_resolve_address_impl(
const char* name, const char* default_port,
grpc_resolved_addresses** addresses) {
GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
grpc_custom_resolver resolver;
grpc_error_handle err =
try_split_host_port(name, default_port, &resolver.host, &resolver.port);
if (err != GRPC_ERROR_NONE) {
return err;
}
/* Call getaddrinfo */
grpc_resolved_addresses* addrs;
grpc_core::ExecCtx* curr = grpc_core::ExecCtx::Get();
grpc_core::ExecCtx::Set(nullptr);
err = resolve_address_vtable->resolve(resolver.host.c_str(),
resolver.port.c_str(), &addrs);
if (err != GRPC_ERROR_NONE) {
if (retry_named_port_failure(&resolver, &addrs)) {
GRPC_ERROR_UNREF(err);
err = GRPC_ERROR_NONE;
}
}
grpc_core::ExecCtx::Set(curr);
if (err == GRPC_ERROR_NONE) {
*addresses = addrs;
}
return err;
}
static void resolve_address_impl(const char* name, const char* default_port,
grpc_pollset_set* /*interested_parties*/,
grpc_closure* on_done,
grpc_resolved_addresses** addrs) {
GRPC_CUSTOM_IOMGR_ASSERT_SAME_THREAD();
std::string host;
std::string port;
grpc_error_handle err = try_split_host_port(name, default_port, &host, &port);
if (err != GRPC_ERROR_NONE) {
grpc_core::ExecCtx::Run(DEBUG_LOCATION, on_done, err);
return;
}
grpc_custom_resolver* r = new grpc_custom_resolver();
r->on_done = on_done;
r->addresses = addrs;
r->host = std::move(host);
r->port = std::move(port);
/* Call getaddrinfo */
resolve_address_vtable->resolve_async(r, r->host.c_str(), r->port.c_str());
}
static grpc_address_resolver_vtable custom_resolver_vtable = {
resolve_address_impl, blocking_resolve_address_impl};
void grpc_custom_resolver_init(grpc_custom_resolver_vtable* impl) {
resolve_address_vtable = impl;
grpc_set_resolver_impl(&custom_resolver_vtable);
}
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